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Stationary vehicle air conditioning system

a technology for cooling systems and stationary vehicles, applied in compression machines with several condensers, light and heating apparatuses, transportation and packaging, etc., can solve the problems of cooling systems that typically require undesirable charging time, components that do not permit the cooling system to operate in an optimal manner, etc., and achieve the effect of optimizing cooling performan

Active Publication Date: 2008-04-01
BEHR GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The patent describes a stationary vehicle air conditioning system with a refrigerant circuit that includes two condensers. The first condenser is cooled by a mechanically driven fan that is powered by the engine, while the second condenser is cooled by an electrically driven fan that is powered by a separate source. The second condenser can be connected in series or parallel with the first condenser. The system is designed to optimize performance in two modes: engine running or stationary. The electrically driven fan can generate an air stream that passes through the second condenser, reducing the required power for the compressor and allowing the second condenser to act as a refrigerant accumulator. The system also includes receivers to collect excess liquid coolant and allows for independent control of the fans. The refrigerant circuit can be set up to act as an additional receiver for refrigerant in a series connection. The technical effects of the patent include improved design for the two condensers, reduced power diverted from the engine, and optimized cooling performance in stationary operation."

Problems solved by technology

This arrangement of components does not permit the systems to operate in an optimal manner.
Other types of stationary air conditioning systems with a cold storage unit are also known in the art, but such cooling systems typically require an undesirable charging time.

Method used

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Examples

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Effect test

first embodiment

[0027]In the invention, as illustrated in FIG. 1, two compressors 5 and 6 are arranged in parallel branches of refrigerant circuit 4. In order to prevent backflow when second compressor 6 is not running, a check valve (not shown) is arranged in the corresponding branch of refrigerant circuit 4, downstream of second compressor 6 in the direction of refrigerant flow. A matching check valve can also be provided in the other branch downstream of first compressor 5.

[0028]The flow of refrigerant through circuit 4 in “normal” operation, i.e., with the vehicle's engine running, will be described first. Compressor 5 drives refrigerant, which is hot as a result of compression, through a first condenser 7 that is cooled by air via a first vehicle-engine driven fan 8. Condenser 7 may be further cooled by wind or by an air stream generated through the motion of the vehicle. Downstream of condenser 7, a first receiver 9 is arranged to collect and temporarily store excess liquid refrigerant. Downs...

second embodiment

[0033]FIG. 2 illustrates a In this embodiment, only a single electrically driven compressor 106 circulates coolant both in normal operation and as needed in stationary operation. This single compressor replaces the parallel branches with mechanically driven compressor 5 and electrically driven compressor 6 of FIG. 1. The circuit thereafter operates as described above.

[0034]FIG. 3 illustrates yet another embodiment in which a hybrid compressor 205 / 206, which can be driven both mechanically by the engine and electrically, may be substituted for the single electrical compressor of FIG. 2. In normal operation, the running vehicle engine drives hybrid compressor 205 / 206, and, in stationary operation, an electrical source (such as batteries, an external power source or an APU) supplies power to compressor 205 / 206. In other respects, this embodiment is similar to the prior embodiments.

fourth embodiment

[0035]the invention is illustrated in FIG. 4. In this embodiment, the circuit 4 splits into two branches downstream of the junction of compressors 5 and 6. A first branch 411 can be closed off by a first valve 410, thereby forming a bypass to the second branch 413, which can be closed off by a second valve 412. In normal operation, first valve 410 is closed and second valve 412 is open, so that refrigerant flows through second branch 413 and thus through condenser 7, and, subsequently, through condenser 14.

[0036]In contrast to the first embodiment, the refrigerant circuit in FIG. 4 does not include a bypass for second condenser 14. Furthermore, receiver 16 is only arranged downstream of second condenser 14. Electrically driven fan 15 supplies cooling air receiver 16, but no air is needed nor supplied to a second receiver, such as receiver 9 in the embodiment of FIG. 1.

[0037]By reference to FIG. 4, the flow of refrigerant during normal operation will now be described. First compresso...

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PUM

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Abstract

The invention pertains to a stationary vehicle air conditioning system with a refrigerant circuit, in which at least one compressor circulates the refrigerant to at least two condensers. The at least one compressor may be powered by the vehicle's mechanical power, by an electrical source, or by a combination of these driving forces. Depending on desired operating characteristics, the condensers may be arranged in a series or parallel configuration. A second compressor also may be added, which second compressor may be powered by a source other than the mechanical energy of the vehicle's engine.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This patent application claims the benefit of German Patent Application No. DE 10 2004 042 691.0, filed Sep. 1, 2004, which is hereby incorporated by reference.FIELD OF THE INVENTION[0002]The invention pertains to a vehicle air conditioning system and method, and more particularly, to an air conditioning system that is particularly advantageous for use with a vehicle in which the engine is not running (a “stationary vehicle”). The invention may be employed, for example, with a truck having a first air conditioner in the driver's compartment and a second air conditioner in a sleeping compartment. The air conditioning system and method includes a plurality of components that may be operated in a first mode while the engine is running and in a second mode while the engine is not running.BACKGROUND OF THE INVENTION[0003]German patent application DE 44 14 547 A1 describes a stationary vehicle air conditioning system in which the vehicle engine...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F25B41/04
CPCB60H1/322B60H1/3227B60H1/323F25B6/00F25B49/027B60H2001/3294F25B5/02F25B6/02F25B6/04F25B2400/0403F25B2400/075
Inventor HEBERLE, ARTHURWEINBRENNER, MARCUS
Owner BEHR GMBH & CO KG
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